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Explosive material composition and method for preparing the same

a technology of explosive material and composition, which is applied in the direction of explosive compositions, ammonium perchlorate explosive compositions, weapons, etc., can solve the problems of difficult to obtain oxidizing agent particles having an average particle size of less than 5 m, low content of water in the agglomerate, and difficulty in molding such agglomerate, etc., to achieve a moderate mechanical strength

Inactive Publication Date: 2010-01-12
NOF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an explosive material composition containing particles of a water-soluble reactive ingredient that have a nearly uniform particle size and a method for producing the same. The inventors found that solid reactive ingredients are maintained a uniform particle for a long time, by once forming a water-in-oil emulsion in which droplets of an aqueous solution of the solid reactive ingredient are dispersed, mixing the emulsion with a thickener and then drying. The dried emulsion has a moderate mechanical strength and can be processed by molding. The explosive material composition includes a dried substance prepared by drying a water-in-oil emulsion containing a water-soluble solid reactive ingredient, an oil ingredient, and a thickener. The dried substance includes an agglomerate which is formed by particles of the water-soluble solid reactive ingredient. Each particle is coated with at least one of the oil ingredient and the thickener. The agglomerate particles can be used in explosive materials and have improved mechanical strength and processing properties. The method for preparing the explosive material composition involves preparing an aqueous solution of a water-soluble solid reactive ingredient, mixing it with an oil ingredient and a thickener to form a water-in-oil emulsion, and drying it. The resulting dried substance has improved mechanical strength and can be processed by molding.

Problems solved by technology

In the method of making fine particles of oxidizing agent using a pulverizing apparatus, obtaining particles of oxidizing agent having an average particle size of less than 5 μm is difficult.
In addition, since freeze-drying sublimes frozen water in the agglomerate, the content of water in the agglomerate is relatively low.
It is technically difficult to mold such agglomerate and the applicable method for the molding is limited to a press method.
An extruding method is not applicable.
Therefore, the oxidizing agent recrystallizes upon drying and the particles of the oxidizing agent become large and non-uniform.
Even if the particle size of the oxidizing agent is small, the obtained material is not preferable because the size of the particles of the ingredient constituting the explosive material composition is not uniform due to the presence of water-absorbing substance of which the size has become larger than the initial size because of water absorption and swelling.
Therefore, the composition has low combustion property and low mechanical strength, and cannot be used as an explosive.

Method used

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  • Explosive material composition and method for preparing the same
  • Explosive material composition and method for preparing the same
  • Explosive material composition and method for preparing the same

Examples

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example 1

[0064]83 parts of nitrate ammonium was added to 12 parts of water and dissolved by heating to obtain an aqueous oxidizing agent solution of about 90° C. A mixture of 1.7 parts of paraffin wax, 0.8 parts of microcrystalline wax and 2.5 parts of sorbitan fatty acid ester surfactant was heated and melted to obtain an oil ingredient of 92° C. A heat-insulated container was charged with the oil ingredient. The aqueous oxidizing agent solution was gradually added to the oil ingredient and the mixture was stirred at 600 rpm for 1 minute and 1600 rpm for 1 minute using a propeller blade stirrer to obtain a water-in-oil emulsion of about 90° C. The water-in-oil emulsion was cooled to room temperature. To 100 parts of the water-in-oil emulsion was added 25 parts of sodium salt of carboxymethyl cellulose (available from Nacalai Tesque, Inc., average particle size 65 μm) functioning as a thickener, and mixing was conducted using a mixer to obtain a mixture.

[0065]A part of the mixture was vacuum...

example 2

[0069]73 parts of ammonium nitrate and 10 parts of guanidine nitrate were added to 12 parts of water and dissolved by heating to obtain a mixed aqueous solution of an oxidizing agent and a fuel of about 90° C. A mixture of 2.5 parts of microcrystalline wax and 2.5 parts of sorbitan fatty acid ester surfactant was heated and melted to obtain an oil ingredient of 92° C. Then, emulsification was conducted under the same conditions as in Example 1 to obtain a water-in-oil emulsion. The water-in-oil emulsion was cooled to room temperature. Subsequently, 10 parts of sodium salt of carboxymethyl cellulose was added to 100 parts of water-in-oil emulsion and mixing was conducted using a mixer. Thereto was added 1.7 parts of activated carbon which is a reducing agent, followed by mixing and a mixture was obtained.

[0070]The mixture was granulated using a 500 μm mesh standard sieve (JIS 8801-1) and the granules were dried at 105° C. for 4 hours to obtain an explosive material composition. The w...

example 3

[0072]A mixture was obtained in the same manner as in Example 1 except that 10 parts of polyvinyl pyrrolidone (Luvitec K90, available from BASF) was used instead of sodium salt of carboxymethyl cellulose and that 1.7 parts of activated carbon was added. After granulating the mixture through the same standard sieve as in Example 2, vacuum drying was conducted at room temperature for 4 days to obtain an explosive material composition. The water content of the explosive material composition was 0.30%. When examined under a microscope, the explosive material composition was found to be agglomerates in which particles having a size of less than 5 μm are combined via the oil ingredient and the thickener.

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Abstract

An explosive material composition containing, as an active ingredient, particles of a water-soluble reactive ingredient having an uniform particle size. Each particle is coated with an oil ingredient and / or a thickener. The coated particles form an agglomerate.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2003-374786, filed on Nov. 4, 2003, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to an explosive material composition and a method for producing the same. The explosive material composition of the present invention can be used for explosives which generate gas and / or heat upon combustion, such as a gun propellant, a propellant, a gas generating agent and a pyrotechnic composition. The explosive material composition of the present invention is not directed to a detonating explosive that causes detonation.[0003]Explosive material compositions generally contain solid reactive ingredients. The smaller the size of the solid reactive ingredient is, the larger the surface area, whereby a higher burn rate of the explosive is achieved. Conventionally, an oxi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C06B45/00C06B31/28C06B31/02C06B21/00C06B29/02C06B29/22C06B31/30C06B47/14
CPCC06B31/30C06B47/145
Inventor OHNO, YOSHIOSERIZAWA, KAZUYATAKAHASHI, KATSUHIKO
Owner NOF CORP
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